Set your oven to 150C.
In a dutch oven or a large deep saucepan add all the ingredients and cover with cold water.
Bring to a simmer, remove any scum from the surface and then place in the oven for 1 hour.
Remove the chicken and set aside to cool and then shred.
Return the lid to the pan and then place the broth in the oven for another 2-3 hours.
Remove from the oven, allow to cool and then pour through a sieve into a bowl.
Store in the fridge or use straight away.